be + forced/compelled/obliged + to + V(不得不……)
例句：Since the examination is around the corner，I am compelled to give up doing sports.
既然考試迫在眉睫，我不得不放棄做運(yùn)動(dòng)。
例句：Since the examination is around the corner，I am compelled to give up doing sports.
既然考試迫在眉睫，我不得不放棄做運(yùn)動(dòng)。